Constraint effects on multiple void interaction in pressure sensitive plastic solids

In this work, effects of pressure sensitive yielding and plastic dilatancy on void growth and void interaction mechanisms in fracture specimens displaying high and low constraint levels are investigated. To this end, large deformation finite element simulations are carried out with discrete voids ah...

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Bibliographic Details
Published in:Engineering fracture mechanics 2009-05, Vol.76 (8), p.1049-1073
Main Authors: Subramanya, H.Y., Viswanath, S., Narasimhan, R.
Format: Article
Language:English
Subjects:
Constraint effects
Ductile fracture
Exact sciences and technology
Finite elements
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Inelasticity (thermoplasticity, viscoplasticity...)
Multiple void interaction
Physics
Pressure sensitive yielding
Solid mechanics
Structural and continuum mechanics
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Summary:In this work, effects of pressure sensitive yielding and plastic dilatancy on void growth and void interaction mechanisms in fracture specimens displaying high and low constraint levels are investigated. To this end, large deformation finite element simulations are carried out with discrete voids ahead of the notch. It is observed that multiple void interaction mechanism which is favored by high initial porosity is further accelerated by pressure sensitive yielding, but is retarded by loss of constraint. The resistance curves predicted based on a simple void coalescence criterion show enhancement in fracture resistance when constraint level is low and when pressure sensitivity is suppressed.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2009.01.007